Abstract: A hail process in Luzhou on May 30, 2020 was compared and analyzed by using the actual observation data, 714X-band dual polarization Doppler radar data and five splicing S-band radar data. The main conclusions are as following: The hail process occurred under the joint action of 200hPa westerly jet, 850hPa shear, ground convergence line and cold air. The whole atmosphere has strong instability, strong wind shear, and various sounding indexes are also conducive to the occurrence of severe convective weather such as hail. In the process, the echo position of X band matches the actual precipitation and hail area, but the echo intensity is weak. The echo position of S band is wester than the actual area, and the echo intensity matches the actual situation better. S-band VIL can better reflect the presence of hail particles. The X-band RHV can effectively distinguish hail and heavy rainfall echo, while the KDP and ZDR have holes, and the application stability is poor, it is necessary to combine other parameters to identify hail.